The Pan-STARRS1 view of the Hyades cluster Bertrand Goldman (MPIA) , - - PowerPoint PPT Presentation

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The Pan-STARRS1 view of the Hyades cluster Bertrand Goldman (MPIA) , - - PowerPoint PPT Presentation

Mar 23, 2024 327 likes •743 views

The Pan-STARRS1 view of the Hyades cluster Bertrand Goldman (MPIA) , S. Rser, E. Schilbach (ARI), C. Olczak (MPIA/ARI), Th.Henning (MPIA), E.A. Magnier (IfA / Hawaii), and the PanSTARRS1 Science Consortium Outline Pan-STARRS1, the most

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The Pan-STARRS1 view

  • f the Hyades cluster

Bertrand Goldman (MPIA),

  • S. Röser, E. Schilbach (ARI),
  • C. Olczak (MPIA/ARI), Th.Henning (MPIA),

E.A. Magnier (IfA / Hawaii), and the PanSTARRS1 Science Consortium

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Outline

  • Pan-STARRS1, the most ambitious optical survey of the decade
  • Instrument(s)
  • Surveys
  • The Hyades cluster:
  • search for

VLM members at large cluster radius

  • PS1 parallax search for nearby BD members

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

GPC1

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

GPC1

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  • 1.8-m dedicated telescope in Haleakala
  • 7-sq.deg. FoV and 1.4 Gpix
  • 13-sec overheads
  • ~80% filling factor
  • 3.5-year duration
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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

GPC1

3

(Megacam)

  • 1.8-m dedicated telescope in Haleakala
  • 7-sq.deg. FoV and 1.4 Gpix
  • 13-sec overheads
  • ~80% filling factor
  • 3.5-year duration
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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

GPC1

3

(Megacam)

y

  • 1.8-m dedicated telescope in Haleakala
  • 7-sq.deg. FoV and 1.4 Gpix
  • 13-sec overheads
  • ~80% filling factor
  • 3.5-year duration
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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Surveys

  • 3π survey (60%):

30,000 sq.deg., 5 filters x 12 exposures see posters by Kim Aller & Will Best

  • Medium Deep Fields (23%):

70 sq.deg., 5 filters ~daily

  • Smaller surveys:
  • transit survey for exoplanets: few fields with high cadence
  • asteroids: broad w filter on the ecliptic plane
  • Andromeda: microlensing, variable stars,…

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

3π survey

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Image quality Single exposure depth

arcsec AB mag

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

3π survey

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All exposures Image quality Single exposure depth

arcsec AB mag

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

3π survey

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All exposures Image quality Single exposure depth

arcsec AB mag

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

z band PS1 vs. SDSS

Stack depth

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Plot by E. Morganson (MPIA)

10σ

  • ver 20x20arcmin2
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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Stack depth

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  • SDSS slightly deeper in g (by 0.11 mag)
  • PS1 deeper in r (0.21), i (0.44) and z (1.28 mag)
  • PS1 has a wider distribution of magnitudes
  • We observe photometrically in all weather/lunation
  • Stacks contain 4-12 images
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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric calibration

  • Über-calibration à la SDSS
  • Schlafly et al. (CfA/MPIA)

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g

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric calibration

  • Über-calibration à la SDSS
  • Schlafly et al. (CfA/MPIA)

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g PS1–SDSS DEC→ ←RA

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric calibration

  • Über-calibration à la SDSS
  • Schlafly et al. (CfA/MPIA)

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g r i z y g PS1–SDSS DEC→ ←RA

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Cluster mass functions & evolution

  • Mass function: slope(s), universality
  • Evolution of clusters:

how do they dissolve into the field

  • Stellar evolution

see Taisiya Kopytova’s talk

  • Binarity

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Cluster mass functions & evolution

  • Mass function: slope(s), universality
  • Evolution of clusters:

how do they dissolve into the field

  • Stellar evolution

see Taisiya Kopytova’s talk

  • Binarity

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Bastian+, ARA&A, 2010

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Cluster mass functions & evolution

  • Mass function: slope(s), universality
  • Evolution of clusters:

how do they dissolve into the field

  • Stellar evolution

see Taisiya Kopytova’s talk

  • Binarity

9

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

The Hyades survey

  • Nearby cluster (47pc)
  • brown dwarfs (Ls at the centre, closest Ts) visible in PS1
  • study the spatial structure & dynamics
  • Intermediate age of 625 Myr
  • Large spatial velocity U,V,W = -41,-19,-1 km/s
  • PM selection to remove field contaminants

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Candidate selection

  • Kinematic selection:
  • convergent point method: |V⫠|< 2 km/s & 7 deg
  • proper motion from PPMXL
  • small PM errors < 20 mas/yr
  • 2MASS ‘A’ flag in J and Ks
  • Photometry from PanSTARRS1
  • Hunt for various problems:
  • erroneously large PMs

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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good: |v⫠|<1 km/s

  • ther kinematic candidates

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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Saturation

good: |v⫠|<1 km/s

  • ther kinematic candidates

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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Saturation

good: |v⫠|<1 km/s

  • ther kinematic candidates

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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R e d d e n i n g

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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R e d d e n i n g

R11 candidates

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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R e d d e n i n g

R11 candidates

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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R e d d e n i n g

R11 candidates g|r|i candidates

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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R e d d e n i n g

R11 candidates rejected in other band

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

12

R e d d e n i n g

R11 candidates gri candidates

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Photometric selection

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R e d d e n i n g

R11 candidates gri candidates

Padova Dusty

AGSS2009 CIFIST2011

Goldman et al. (submitted to A&A)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Contamination

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Simulation Data

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Previous studies

  • Double the numbers of candidates with m<0.15M⨀
  • Refine Röser et al (2011) sample:

refine poor CMC photometry or PPMXL PMs

  • Confirms 13 candidates of Bouvier et al. (2008),

rejects five (kinematic)

  • Not sensitive to Hogan et al. L dwarfs (depth)
  • 2MASS J0230155+270406 L0: Cruz et al (2007)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Mass functions

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all 0<<3.1pc 3.1<<9pc 9<<18pc 18<<30pc

Simulation by Ernst et al (ARI)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Spatial distribution

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Spatial distribution

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Going Deeper with PS1 proper motions

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

PS1-only PMs: 1st optical candidate

  • 2MASS J04482244+2051433 M6V

Luhman (2006) as Taurus candidate??

  • PS1 PMs: +92±6, -36±5 mas/yr

[no good match in PPMXL, USNO-B1, NOMAD]

  • PS1 parallax: 19±7 mas
  • vs. kinematic: 22±1 mas

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

PS1-only PMs: 2nd optical candidate

  • LP 155-252
  • PS1 PMs: +121± 7,–75±7 mas/yr
  • vs. +113, –66 mas/yr*
  • PS1 parallax: 21±5 mas
  • vs. kinematic: 18±1 mas

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* Lépine & Shara (2005)

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

PS1 parallaxes of kinematic candidates

  • Require baseline>1.5 years, 8+ detections, good PM, π
  • 50% of the sample

after two seasons

  • 1.5 105 objects with large PMs
  • 400 kin. candidates
  • 160 candidates

based on PS1 parallax

  • Still requires photometric

parallax confirmation

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

PS1 parallaxes of kinematic candidates

  • Require baseline>1.5 years, 8+ detections, good PM, π
  • 50% of the sample

after two seasons

  • 1.5 105 objects with large PMs
  • 400 kin. candidates
  • 160 candidates

based on PS1 parallax

  • Still requires photometric

parallax confirmation

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Bertrand Goldman (MPIA) PanSTARRS1 and the Hyades cluster – Fuerteventura 20/05/13

Conclusions

  • Derived the MF to 0.1M⦿ to larger cluster radii
  • double the numbers of candidates with m<0.15M⨀
  • depletion of

VLM stars in the centre

  • Cluster simulations provide a roughly good picture
  • but room for improvements
  • Multi-band coverage and astrometry improve purity
  • soon parallaxes to allow search for nearby BD members

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